Centrifugal pulverizing-mill



(No Model.) 3 Sheets-Sheet 1.

G. R. KING & A. RAYMOND. GBNTRIFUGAL PULVERIZING MILL.

No. 579,588 Patented Mar. 30, 1897.

AT mm.

(No Model.) 3 Sheets-Sheet 2 G. R. KING & A. RAYMOND. GENTRIFUGALPULVERIZING MILL.

No. 579,588. Patented Mar. 30, 1897.

WIN/E8858 (No Model.) 3 Sheets-Sheet 3.

G. R. KING & A. RAYMOND.

GENTRIPUGAL PULVERIZING MILL.

No. 579,588. Patented Mar. 30, 1-897.

AT y.

ATEN'T FFIQE.

GEORGE R. KING, OF NEl/Y YORK, N. Y., AND ALBERT RAYMOND, OF CHICAGO,ILLINOIS.

CENTRIFUGAL PU LVERlZlNG-MILL.

SPECIFICATION forming partof Letters Patent No. 579,588, dated March 30,1897'. Application filed July 17, 1896. Serial No. 599,521. (No model.)

To (025 whom, it may concern.-

Be it known that we, GEORGE R. KING, re-

siding in the city, county, and State of New York, andALBERT RAYMOND,residing in the city of Chicago, in the county of Cook and State ofIllinois, citizens of the United States, have invented a new and usefulVertical- Roller Pulverizing-Mill, of which the following is aspecification.

Our invention relates to improvements in that class of pulverizingmachines or mills which have for their object the reduction to a finepowder of various substances, as lime, gypsum, quartz, ores, coal, &c.

The objects of our invention are to simplify the construction andincrease the durability and effectiveness of such mills and render themless expensive and less exhaustive of power to run them, all of which weattain by the mechanism illustrated in the accompanying drawings, inwhich- Figure 1 represents a side elevation; Fig. 2, an end view of thecarrying-shaft and a pin-fork which is part of the device for giving,when desired, a lengthwise or endlong movement to the rollers of themill; Fig. 3, a transverse section on the line w w of Fig. 4; Fig. 4, avertical section on the line 3 y of Fig. 3 with carrying-frame inelevation Fig. 5, a carrying-frame consisting, preferably, of a singlecasting of steel, having disks for closing the ends of the mill andslotted heads for holding and operating the roller-shafts, as willappear in the following description.

Like numerals and letters refer to like parts throughout the severalviews.

1 is a cylindrical shell or case provided with suitable feet 2 to secureit to some proper foundation.

3 are annular heads provided with central circular openings extendingfrom a to a. (See Fig. 4.) These annular heads and the cylindrical shellare provided with flanges b b and securely united together with thebolts 0 c, and taken together constitute the chamber in which therollers operate.

4: are four fiat-ring dies securely fastened to the inner surface of thesaid shell, and 5 are four mutually-balanced pulverizing-rollers, whichrevolve and travel one only on the inner surface of each of the saiddies. These four rollers are rigidly mounted on the two roller-shafts 1010, being two rollers on each shaft, each pair of the rollers beingplaced laterally on their respective shafts in such a position as tobring those on one shaft between those on the other, whereby rollers ofmuch greater diameter can be employed in a shell of given dimensionsthan if they were placed opposite each other.

To render it possible to employ these large rollers and control them inthe lengthwise or endlong direction and allow them the needed radialmovement in traveling over the ma terial in its different stages ofreduction constitutes one of the objects and special features of ourinvention. This we accomplish by the rigid carrying and operating frameshown by Fig. 5. This entire figure repre sents a preferably singlesteel casting, which embraces the right-angle quad rangularframe proper,6 6, the slotted closing-disks 8 8, which (when in position) close thecentral openings at the annular heads 3 3 of the cylindrical shell 1,and the slotted carrying-head pieces 7 7, in which are carried andoperated the roller-shafts and also the two short protruding shafts 9 9,on which the entire movable parts of the mill are supported andactuated. Within the slots of these slotted head-pieces are suitableradially-sliding bearing-boxes 11 11 for holding and carrying theroller-shafts 1O 10. To give the rollers a constant radial action andkeep them in yielding contact with their respective dies, spiral springs12 12 (see Fig. 3) are placed under these bearing-boxes, whereby theroller-shafts can radially tilt or rock to accommodate the radialmovement of the rollers caused by their rolling over material ofdifferent degrees of reduction.

17 are supports for carrying the two protruding shafts 9 9, one of whichshafts being sufficiently elongated to take the driving-puL ley 16.

14 is an opening in the side of the cylindrical 5 shell to receive areturn-current of air when dry material is to be pulverized, and 15 isan opening over which is mounted, when dry material is to be reduced,some sort of dry separator, either of which openings (141: or 15) cancan be utilized as a hopper, into which the material to be pulverizedcan be fed to the mill.

On the sides of the cylindrical shell and annular heads 3 3 areprotrusions or shields 18, between which and the shell proper areprovided screens 19 and openings 20 (see Fig. 3) for discharging thematerial after it is pulverized and passed through the screens, thesescreens and discharge-openings being employed only when water isemployed in the operation.

An additional feature of our device, but not indispensable to theconstruction and operation of the mill as far as above described, is thegiving of the rollers a to-andfro lengthwise or endlong motion as theyrevolve around on their respective dies. This we accomplish by givingsuch a lengthwise or endlong motion to the carrying-frame, as shown inFig. 5, in which are mounted and operated the roller-shafts. The deviceshown for executing this lengthwise or endlong motion of the rollers(though we do not limit ourselves to this precise method) is seen on theleft of Fig. 1, which consists of the lever 21, provided with a pin-forkat the top (see Fig. 2) working in a groove 22, cut in the left-handprotruding shaft 9. This lever has its fulcrum 011 the pin 23 and isoperated at the other end by a crankdisk 24, the pin of which, 25, worksin the slot 26 of the lever. The crank-disk may be operated by asprocket-chain connecting the shaft 9 to the crank-disk 24:, as shown inFig. 1, whereby the eXtrem ely-limited lengthwise motion of the shaftand rollers is produced, as indicated by the dotted lines in Fig.4,drawn parallel with the sides of the rollers. As will be seen, thismotion is but slight, only sufficient to cover the face of the dies bythe tread of the rollers to prevent, as well, the tread of the rollersfrom constantly traveling in the same track, and thereby prevent therollers from wearing a groove in the dies and thus increasing theirdurability. This motion is so limited in scope and so slow of actionthat the sprocket-chain connecting the shaft with the crank-disk willeasily effect the operation.

'I-Iavin g pointed out the several parts of our device and substantiallyalluded to the functions of the same, it is not necessary tofurtherdescribe the operation of our mill, only by pointing out some ofthe advantages attained by the peculiar construction thereof.

By means of the quadrangular frame with the protruding shafts 9 9 andslotted headpieces for carrying the roller-shafts we attain, first, theplacing of all the working parts of the mill except the rollers outsideof the shell, whereby they'are not out and worn and obstructed by thematerial to be and being pulverized second, by the employment of rollersof greater diameter than would be possible with an operating-shaftpassing through the center of the shell, whereby the mill is made moreeffective, as rollers of larger diameter are more efficient; third, byplacing the rollers side by side of each other instead of directlyopposite each other each roller has its own die, whereby each roller ismore thoroughly fed with the material to be crushed and triturated andthe dies are not so rapidly worn; fourth, by the peculiar method of ourconstruction a mill of a given number of rollers and capacity will notcost much if any more than half as much as such mills do as heretoforeconstructed.

e do not necessarily limit ourselves to the use of two roller-shafts, asthree may be employed by making the rollers a little less in diameter.Neither do we limit ourselves to two rollers on a shaft, as one might beused on one of two shafts and two on the other by making the singleroller equal in weight to the two on the other shaft, so that the onewill counterbalance the two. In fact, it is found in practice that toomany rollers running at high speed are not so effective as a smallernumber, and that rollers less in width or thickness and larger indiameter are more efficient.

The advantage of giving a limited to-andfro lengthwise or endlong motionto the rollers is to produce to some extent a slipping or rubbing actionbetween the rollers and their respective dies, which we accomplish bythe device illustrated and described. Besides, this lengthwise orendlong movement renders the same mill more effective and increases itsdurability,

That we claim as new and useful, and desire to secure by Letters Patent,is-- 1. In a centrifugal-roller pulverizing-mill the quadrangular frame6, having the slotted heads 7 7, slotted disks 8 8 and projecting shafts9 9, in combination with the rollershafts 10, rollers 5, dies 4,cylindrical shell 1 and annular heads 3, substantially in the manner andfor the purpose described.

2. In a centrifugal-roller pulverizing-mill the quadrangular frame 6,having the slotted heads 7 7, slotted disks 8 8 and projecting shafts 99, in combination with the rollershaft-s 10, having the radially-slidingbearingboXes 11 and springs 12, the rollers 5, dies 4, cylindrical shell1 having the annular heads 3 and pulley 16, substantially as and for thepurpose described.

3. In a centrifugal-roller pulverizing-mill the quadrangular frame 6,having the slotted heads 7 7, projecting shafts 9 9, dies 4: andcylindrical shell 1 in combination with the lever 21, disk-crank 26 andsprocket-chain 27 substantially in the manner and for the purpose setforth.

4. In a centrifugal-roller pulverizing-mill a central quadrangularroller-shaft frame insubstantially as and for the purpose declear openinterior space within which rollers may be mounted of such largediameters that they extend past the axis of the carrier and past eachothers peripheries, and having" chamber-closing disks and slottedshaft-carrying heads and protruding carryin g-shafts,

closed Within a cylindrical shell and having a scribed.

GEORGE R. KING.

ALBERT RAYMOND.

Witnesses:

A. W. MITCHELL, O. R. SENGSTACK.

